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Can you check if the same occurs in safe mode?
http://talk.sonymobile.com/t5/FAQ/How-to-boot-your-phone-into-safe-mode/m-p/348008
Also,do you have a screen protector?
Usually antiviruses can be involved,maybe task killers.
What have you installed lately? You should check back in normal mode,maybe it is fine.
Hi Max,
Evan I am facing the same issue, what did you do to fix this?